Senior Software Development Engineer in Test
Aplazo · Mexico
About the Role
We're looking for a Senior SDET (Software Development Engineer in Testing) to elevate engineering quality across Aplazo. This is an engineering role—you'll write production-grade code and maintain automated tests independently; improve existing suites and coverage in your own area, adapt and improve test plans for medium/large features, execute end-to-end with little guidance and give clear feedback to engineers on quality.
You're not a QA gatekeeper. You're an engineer who's passionate about quality and believes the best way to achieve it is by empowering every engineer to test better. You'll build the tools, frameworks, and practices that make quality a natural part of how we work.
You lead quality initiatives for your squad and mentor engineers on testing practices.
What You'll Do
Mentor engineers on quality — Pair with engineers to improve their testing practices; TDD, and test design
Own test strategy — Define testing approaches (unit, integration, contract, e2e) for your squad
Write code — Build production-grade automation, testing tools & test scripts
Drive quality metrics — Instrument and track quality signals (coverage, flakiness, test times, defect rates); use data to prioritize improvements
Leverage AI for quality — Use AI to generate tests, identify coverage gaps, and accelerate quality feedback loops
Shift quality left — Help engineers catch issues earlier through better design, testability coaching, and fast feedback
What We're Looking For
Technical
3 - 5+ years as a software engineer or SDET
Strong programming skills—you will write production code, not just test scripts (Java, selenium, cucumber, Appium (for mobile test), RestAssured (for API testing))
Deep expertise in test architecture: unit, integration, contract, and e2e testing strategies
Proficient with CI/CD, integration and test automation with Jenkins pipelines and GitHub Actions for solution builds and deployments.
Familiar with our stack or similar: Java/Spring, Angular/Flutter, AWS, PostgreSQL, MongoDB, Datadog, Postman, Bruno and JMeter
AI Fluency
Uses AI tools to generate test cases, identify edge cases, and accelerate test development
Applies AI to detect flaky tests, analyze coverage gaps, and prioritize testing efforts
Builds or champions AI-powered quality tools for the team
Stays current on AI-assisted testing capabilities and best practices
Quality Philosophy
Believes engineers should own quality—your job is to enable them, not replace them
Thinks about testability during design, not just after implementation
Pragmatic about test coverage—you optimize for confidence
Understands testing and when to break the rules
Leadership & Communication
Experience in coaching engineers and changing team practices
Writes clear documentation and runbooks
Fluent in Spanish; working knowledge of English for cross-team collaboration
Mindset
Engineer first, quality specialist second
Passionate about developer experience—you build tools people love to use
Strong ownership; you drive quality improvements end-to-end
Curious about fintech-specific quality challenges (financial accuracy, compliance, fraud)
Nice to Have
Experience in fintech, payments, or high-reliability systems
Background in mobile testing (Flutter, iOS, Android) & testing frameworks like Maestro or Patrol.
Performance and load testing experience
Contract testing (Pact) or API testing expertise
Contributions to open-source testing tools or frameworks
Experience managing a mobile device farm (Sauce Labs)
Our Stack
Languages: Java, Python
Frameworks: JUnit, TestNG, Playwright, Selenium, Appium, Maestro/Patrol
API Tooling: Postman/Bruno, Jmeter/LoadRunner, Rest Assured
CI/CD: Jenkins, GitHub Actions, CodeMagic
Infrastructure: AWS, Pulumi
Observability: DataDog
Why Aplazo
Our mission is to empower financial access and opportunity across Latin America through fair, simple, and transparent solutions. Our tech vision: be the most beloved and innovative tech organization in Latin America.
We're a Series B fintech growing fast—quality is critical when you're handling millions of financial transactions. You'll shape how 50+ engineers think about and practice quality.